Most of on-vehicle DSRC apparatus are mounted on a dashboard of a vehicle and downsized not to hinder vision. Therefore the number of switches disposed on a panel is limited, while increase in number of functions is expected. Moreover, since an on-vehicle DSRC apparatus is operated while driving, a function key method adapted to operate keys visually is not applicable. Accordingly, an apparatus capable of performing multiple functions, in which can be assigned to one switch and operation can be performed without viewing, is demanded. A press button is operated to punch Morse code. Different functions are preliminarily allotted to respective punching patterns. A switch determination section stores the allotted functions, analyzes a press pattern and determines a function to be allotted. One switch serves multiple functions including sound volume setting, history confirmation, and on-vehicle apparatus identification number, achieving a small size on-vehicle DSRC apparatus at reasonable price.